The Michigan Department of Agriculture is fighting the devastation caused by the Emerald Ash Borer and Thursday crews were in residential areas.
Crews say they are cutting down 22,000 trees in Delhi and Meridian Townships, and south Lansing.
They started cutting down trees last month and inspectors say the first week of July is peak flying season for the metallic green beetle.
They are finding out the infestation is worse than first thought. The trees will be chipped into small pieces and eventually burned at a place in Flint.
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Emerald Ash Borer
The Emerald Ash Borer belongs to a group of insects known as metallic wood-boring beetles.
Adults are dark metallic green in color, 1/2 inch in length and 1/16 inch wide, and are only present from mid May until late July. Larvae are creamy white in color and are found under the bark.
The borer's host range is limited to species of ash trees (identified by their distinctive leaves, which are located directly across from each other on the leaf stem, and bark).
In Michigan, most ash tree are white, black or green.
Emerald Ash Borer does not attack mountain ash, which is not related to white, black, or green ash trees.
Usually their presence goes undetected until the trees show symptoms of infestation – typically the upper third of a tree will die back first, followed by the rest the next year.
This is often followed by a large number of shoots or sprouts arising below the dead portions of the trunk.
The adult beetles typically make a D-shaped exit hole when they emerge. Tissue produced by the tree in response to larval feeding may also cause vertical splits to occur in the bark. Distinct S-shaped tunnels may also be apparent under the bark.
Source: http://www.michigan.gov/mda (Michigan Department of Agriculture Web site) contributed to this report.